Best API Gateways & Backends GitHub Repositories

☕️⚡️TShock provides Terraria servers with server-side characters, anti-cheat, and community management tools.

Code as configuration. Annotate a Java entity with @Erupt and ship a production-grade admin backend in minutes — UI, RBAC, audit logs and APIs, all generated at runtime. No codegen, no frontend.

Your Self-Hosted Knowledge Base

Twitter4J is an open-source Java library for the Twitter API.

HarnessRouter Community Edition: the self-hosted, Apache-2.0 edition of the unified interface for agent harnesses. Run Codex, Claude Code, Hermes, PI, DSH, and more through one API, with sessions, streaming, files, cancellation, and failure handling. Implements the Unified Harness Protocol (UHP), an open standard. Your keys, your infrastructure.

The modding API for Stardew Valley.

Qwen3.8-Flash-Next (125B MoE) on a 8GB+ NVIDIA GPU: one-click install for Windows / Linux. Strata inference engine, OpenAI/Anthropic API on localhost, optional image input.

The official .NET library for the OpenAI API

Real-time monitoring for Plex, Jellyfin, and Emby servers. Track streams, analyze playback, and detect account sharing from a single dashboard.

Build, run and scale AI agents like API and microservices

A desktop GUI for CLIProxyAPI and a tool for automatically configuring popular AI agents.

Go library for the VMware vSphere API

Use Hugging Face with JavaScript

XERJ is the new way for AI to search data. Its autoindex capability activates agents to know your data without the token waste of grep and sed. One command indexes code, docs, logs and PDFs for search, RAG, security audits and agent memory, using 40x fewer tokens than grep. Elasticsearch compatible, so existing clients just work.

Best headless browser for AI agents. Lite, Fast, High-Compatibility. Built in Rust

🔥 HAPI FHIR - Java API for HL7 FHIR Clients and Servers

Access other storage backends via the S3 API

Open-source AI Security Operations Center: alert fusion, LLM-agent triage, MITRE ATT&CK investigation, and a replayable decision ledger for every agent step. Self-hostable, runs with no API keys, MIT licensed. Ships an MCP server for Claude, Cursor and Continue.

📼 The missing YouTube and YouTube Music macOS app

Ruby library for the Stripe API.